[remoting] Reduce HeartbeatSender log verbosity

Previously HeartbeatSender logs a bunch of stuff like sequence ID and
signature, which are not very useful now and spams the log. This CL
reduces the verbosity of the log to just log JID and FTL ID.

Bug: 969199
Change-Id: Id32e1aaab611793a0943eb359bec7439343d45d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1639365
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Auto-Submit: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665352}

remoting/host/heartbeat_sender.cc

@@ -105,17 +105,14 @@ HeartbeatSender::HeartbeatClient::~HeartbeatClient() = default;
 void HeartbeatSender::HeartbeatClient::Heartbeat(
     const apis::v1::HeartbeatRequest& request,
     HeartbeatResponseCallback callback) {
-  HOST_LOG << "Sending outgoing heartbeat:\n"
-           << "signature: " << request.signature() << "\n"
-           << "host_id: " << request.host_id() << "\n"
-           << "jabber_id: " << request.jabber_id() << "\n"
-           << "tachyon_id: " << request.tachyon_id() << "\n"
-           << "sequence_id: " << request.sequence_id() << "\n"
-           << "host_version: " << request.host_version() << "\n"
-           << "host_offline_reason: " << request.host_offline_reason() << "\n"
-           << "host_os_name: " << request.host_os_name() << "\n"
-           << "host_os_version: " << request.host_os_version() << "\n"
-           << "=========================================================";
+  std::string host_offline_reason_or_empty_log =
+      request.has_host_offline_reason()
+          ? (", host_offline_reason: " + request.host_offline_reason())
+          : "";
+  HOST_LOG << "Sending outgoing heartbeat."
+           << " jabber_id: " << request.jabber_id()
+           << ", tachyon_id: " << request.tachyon_id()
+           << host_offline_reason_or_empty_log;
 
   auto client_context = std::make_unique<grpc::ClientContext>();
   auto async_request = CreateGrpcAsyncUnaryRequest(